board: rock5b-rk3588: add memory gaps into kernel's DTB
RK3588 has two memory gaps when using 16 GiB DRAM size:
[0x3fc000000 , 0x3fc500000]
and
[0x3fff00000 , 0x3ffffffff]
If the kernel is agnostic to these gaps, accessing the area causes
a SError panic.
Hence, add reserved memory areas in kernel's DTB before booting.
Signed-off-by: Eugen Hristev <eugen.hristev@collabora.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/board/radxa/rock5b-rk3588/rock5b-rk3588.c b/board/radxa/rock5b-rk3588/rock5b-rk3588.c
index b5d7479..5c3b52b9 100644
--- a/board/radxa/rock5b-rk3588/rock5b-rk3588.c
+++ b/board/radxa/rock5b-rk3588/rock5b-rk3588.c
@@ -2,3 +2,38 @@
/*
* Copyright (c) 2023 Collabora Ltd.
*/
+
+#include <fdtdec.h>
+#include <fdt_support.h>
+
+#ifdef CONFIG_OF_BOARD_SETUP
+int rock5b_add_reserved_memory_fdt_nodes(void *new_blob)
+{
+ struct fdt_memory gap1 = {
+ .start = 0x3fc000000,
+ .end = 0x3fc4fffff,
+ };
+ struct fdt_memory gap2 = {
+ .start = 0x3fff00000,
+ .end = 0x3ffffffff,
+ };
+ unsigned long flags = FDTDEC_RESERVED_MEMORY_NO_MAP;
+ unsigned int ret;
+
+ /*
+ * Inject the reserved-memory nodes into the DTS
+ */
+ ret = fdtdec_add_reserved_memory(new_blob, "gap1", &gap1, NULL, 0,
+ NULL, flags);
+ if (ret)
+ return ret;
+
+ return fdtdec_add_reserved_memory(new_blob, "gap2", &gap2, NULL, 0,
+ NULL, flags);
+}
+
+int ft_board_setup(void *blob, struct bd_info *bd)
+{
+ return rock5b_add_reserved_memory_fdt_nodes(blob);
+}
+#endif
diff --git a/configs/rock5b-rk3588_defconfig b/configs/rock5b-rk3588_defconfig
index 9b7db7d..f3026c7 100644
--- a/configs/rock5b-rk3588_defconfig
+++ b/configs/rock5b-rk3588_defconfig
@@ -26,6 +26,7 @@
CONFIG_FIT_VERBOSE=y
CONFIG_SPL_FIT_SIGNATURE=y
CONFIG_SPL_LOAD_FIT=y
+CONFIG_OF_BOARD_SETUP=y
CONFIG_DEFAULT_FDT_FILE="rockchip/rk3588-rock-5b.dtb"
# CONFIG_DISPLAY_CPUINFO is not set
CONFIG_DISPLAY_BOARDINFO_LATE=y